单项选择题

（） the most versatile of the common metals, lead was widely valued and used in ancient times.

A. It is
B. Therefore
C. Among
D. Because

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Mr. Wang and his son, both looking very happy,（）taking a walk in the park.

A. are
B. is
C. has
D. have

单项选择题

Spanish people usually speak （） than English people.

A. quick
B. more quick
C. more quickly
D. quicken

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